🧭 DocOps: docs + GitHub workflows

[kuasar-mknd]

This PR contains documentation updates following a DocOps audit:

• What docs changed:
  • docs/ARCHITECTURE.md: Replaced npm with pnpm under Key Technologies and corrected CI workflow setup script examples from npm ci --legacy-peer-deps to pnpm install, accurately reflecting the repository's migration to pnpm.
  • docs/ENV.md: Added explicit documentation mapping the environment variables to the exact ImportMetaEnv TypeScript interface defined in src/env.d.ts to improve developer clarity.
  • .jules/docops-history.md: Appended a new row to document the scope of changes, honoring the Anti-Loop rule by isolating the focus strictly to ENV.md and ARCHITECTURE.md (which were not modified in the last iteration).
• What workflows were added: None were needed. The repo already contains correctly configured, fully automated CI, Deploy, Dependabot, and Security workflows matching the latest conventions.
• How to verify:
  1. pnpm install
  2. pnpm run check
  3. bun test src/ tests/
  4. pnpm run build
  5. pnpm run test:e2e
• Assumptions: Detected pnpm usage from pnpm-lock.yaml and correctly inferred the Astro static generation architecture and testing strategy (bun for utils, playwright for e2e).

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PR created automatically by Jules for task 1922163299165085949 started by @kuasar-mknd

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